Fatal error: Uncaught Error: Call to undefined function trailingslashit() in /var/www/vix_wp/wp-includes/class-wp-textdomain-registry.php:103
Stack trace:
#0 /var/www/vix_wp/wp-includes/l10n.php(784): WP_Textdomain_Registry->set()
#1 /var/www/vix_wp/wp-includes/load.php(1401): load_textdomain()
#2 /var/www/vix_wp/wp-includes/load.php(278): wp_load_translations_early()
#3 /var/www/vix_wp/wp-settings.php(74): wp_maintenance()
#4 /var/www/vix_wp/wp-config.php(97): require_once('/var/www/vix_wp...')
#5 /var/www/vix_wp/wp-load.php(50): require_once('/var/www/vix_wp...')
#6 /var/www/vix_wp/wp-blog-header.php(13): require_once('/var/www/vix_wp...')
#7 /var/www/vix_wp/index.php(17): require('/var/www/vix_wp...')
#8 {main}
thrown in /var/www/vix_wp/wp-includes/class-wp-textdomain-registry.php on line 103